Exitting the Gene & region set app with Esc has unexpected behavior

[nrockweiler]

This is very very minor.

1. Load a gene & region set
2. Click on the gene set in the gene & region set app.
3. Click edit.
4. Click "change >>". A window will pop up (I'll call this the flanking regions window):
5. Press Esc. This will exit out of the gene & region set app, but it won't exit out of the flanking regions window:

I think the user would expect to see both the flanking regions window and the app window to disappear upon pressing esc.

(Note: this only happens with pressing Esc. Clicking the X in the edit window will close the edit window and the flanking window as expected.)

To get rid of the phantom flanking regions window, the user just has to click outside of it, but this might not be known to the user. An alternative could be to add a "Submit" and a "cancel" button to the flanking regions window.

[debugpoint136]

Thanks Nicole. Will look into this.